My Chiro physician ask me to look up bilateral modifiers for him. He said he often adjust extremities B/L and wants to report them correctly.

Also, how does he distinguish different anatomical regions of extremities being adjusted so that the payors aren't confused with 98943 reported 2x on the same OV? Is that modifier 51 on the 2nd one and not on the 1st?

98943 is an extremity adjustment code, many payers will not cover it and honestly, I've never seen a payer cover it with more than one unit, as it would definitely lean towards maintenance at that point, but you can bill it with a 50 modifier. 51 is usually used for CPT Codes that are classified as surgical.